Experimental Physics and Industrial Control System
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I see that I was in error -- it appears that it is only possible to have a newline in a prompt by passing it in as an environment variable from the shell. But pickup up values from the environment has been a capability of the IOC shell for a long time. I have many IOCs with startup scripts that set a value that can be overridden from the external environment. For example: epicsEnvSet("IM540_1_SERIAL","$(IM540_1_SERIAL=serialserver03:2001)")
I had tried the continued line approach
(a '\' as the last character). But all attempts to include a line
break withing the string just results in an error:
##--- set IOC shell prompt ---
epicsEnvSet IOCSH_PS1, "\
st.cmd -- Line 200 -- Unbalanced quote.
mdlinux> "
st.cmd -- Line 201 -- Unbalanced quote.
I had not thought of setting a value before launching the IOC
shell. Unfortunately, it doesn't appear to pay any attention to
the bash shell environment variables (excluding, of course, the
standard ones the EPICS code itself requires, such as the
EPICS_XXX ones, shown by the epicsParamShow command).
Now that I am looking for it, I am surprised that I have not been
able to find even so much as a hint that commands in the IOC shell
can make use of arbitrary environment variables that are set
anywhere other than within the IOC shell itself (i.e. other than
the special-case/standard ones). I had assumed that this WAS
possible, even if it required some command to do so. But I have
yet to find any command to due this, or any mention at all of some
built-in way logic to support it).
Even more interesting is IOCSH_PS1 itself. Although the
epicsEnvSet command is used to set it, epicsEnvShow says it is NOT
an environment variable:
epics> epicsEnvShow IOCSH_PS1
IOCSH_PS1 is not an environment variable.
(also not in the list shown if you just type epicsEnvShow)
Perhaps your examples require a newer version of EPICS? (I am
using R3.14.12.2) But again, numerous Google searches have failed
to turn up any document that mentions this one way or the other.
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- References:
- newline in IOCSH_PS1 value Mark Davis
- Re: newline in IOCSH_PS1 value Eric Norum
- Re: newline in IOCSH_PS1 value Mark Davis
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ANJ, 17 Dec 2015 |
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